Solvent for nitrocellulose.



substances and in films used for photoof pyroxylin.

amount of the pyroxlin.

Las

- solvent in itself, forms a vgood solvent mix- -bining ltwo or moresubstances with each other. The components of the mixed sol= so1vent,-sngle substances being rarely used UNiTED sTATEs PATENT orinon.iV

WILLIAM G. LINDSAY, .0F NEW YORK, Y.,

ASSIG'NOR TO THE CELLULOID COMPANY, i

0F NEW YORK, N. Y., CORPORATIONOF NEW JERSEY.

soLvENT Fon NITRocELLULosE.

graphic and therapeutic purposes, and consist of soluble -pyroxylin or nitrocellulose combined with o r dissolved in' certain other substances or menstrua known as solvents Although theiinal or useful A4form of the ditlerent compounds of this class isthat of a solid or dried material, the differentprocesses of conversion into this final solid ltorm involve, as is Well understood,the employment of pyroxylin solutions or mixtures, of varying consistency as to plasticity, stiffness or fluidity, dependent generally upon .the proportion and kind of solvent used to the There are two classes of solventsliquid solvent`s,of Whichmethyl alcohol, orwood spirit, is a good example,.and solid solvents, of which camphor is a good representative. Solvent mixtures are also formed by Acomvent in such a case may not necessarily be possessed of indivldual solvent power'. Forinstance, alcohol, wh1ch 1s practlcally anonture when camphor is dissolved in it. The various applications of this art require the employment of complex mixtures in the for such purposes; hence, while the' advancement of the art has depended largely on the discovery and application of new single solvents, yet it has required also the, invention of combinations of solvents by which effects are produced quite dierent fromthose produced when single" solvents are employed alone. y

The action of some solvents or diluents is Specification of Letterst Patient. Application led August 1,1,

1911. Serial No. 643,483.`

quite' distinct from that of others, vliquid or solid, inv that they require a shorter vor longer time for seasoning of the material, and inthe case of a solid, solvent they leave it incorporated with the resulting dried product after the levaporation of the liquid .solventso that it can be molded into fforms.

under heat and pressure.

I have discovered that cthyleneacetochlor-v hydrin CILCL CH2OOCCH3 is a valuable solvent of nitrocellulose. po-int of about 145 C., is substantially insoluble in water; isstable and the products, such as films, varnishes, sheets, solid objects,

free from odor.

coatings,

As one example of carrying out 'my inven tion practically I A proceed as follows :-I take one part of nitrocellulose and introduce itinto ten parts by Weight of-ethyleneacetochlorhydrin. lThe nitrocellulose dissolves slowly; the solution is promoted by stirring and suitable mixing. Thesolution thus pre-..

pared may be used alone or with othersolvents or non-solvent liquids such as methyl,

or ethyl alcohol, acetone, ethyl acetate, etc.

Films or solid objects prepared, by allowing the solutions to 'evaporate are particularly tough and flexible an'd substantially Without odor unless camphor has been used.

What I claimand desire to secure by Letters Patent is: .I 1. Anew composition of matter consist;-

ing of asolution of nitrocellulose in ethyl-` eneacetochlorhydrin. Y.

Patented May 28,1912.

It has a boiling.

etc., are substantially resulting `2. A newA compositionof matter consist ing of a solution of nitrocellulose in-ethyleneacetochlorhvdrin in admi Xture with other solvents -or diluents, substantially sis-described.

- 3. A new composition of matter consisting of a solution of nitrocellulose in' ethyleneacetochlorhydrin in admixture with other solvents or diluents and solid matters such as coloring matters and inert material.

WILLIAM G. LINDSAY.

Witnesses:

J. E. HINDoN HYDE, MABEL DEN'roN. 

